YAML Validator

YAML (YAML Ain't Markup Language) is a human-readable data format used for configuration files, CI/CD pipelines, and infrastructure as code. It uses indentation for structure, which makes it easy to read but sensitive to formatting errors. Kubernetes, Docker Compose, and GitHub Actions all use YAML.

YAML errors can be subtle — a single tab instead of spaces, or missing colons, can break parsing. Validating before deployment catches these issues early. A validator also helps you understand the resulting structure by showing the equivalent JSON output.

Use spaces for indentation, never tabs. Ensure a space after the colon in key: value. Be careful with yes, no, on, off — they're interpreted as booleans; quote them if you need strings. For multi-line values, use proper YAML block scalars (| or >) or quoted strings.